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optimized implementation of Channel.Names()

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This commit is contained in:
Shivaram Lingamneni 2018-04-24 05:46:01 -04:00
parent ef35c587fc
commit 6533893863
1 changed files with 38 additions and 48 deletions
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84
irc/channel.go
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@ -6,6 +6,7 @@
package irc
import (
"bytes"
"crypto/subtle"
"fmt"
"strconv"
@ -180,27 +181,47 @@ func (channel *Channel) regenerateMembersCache() {
// Names sends the list of users joined to the channel to the given client.
func (channel *Channel) Names(client *Client, rb *ResponseBuffer) {
currentNicks := channel.nicks(client)
// assemble and send replies
maxNamLen := 480 - len(client.server.name) - len(client.nick)
var buffer string
for _, nick := range currentNicks {
if buffer == "" {
buffer += nick
isMultiPrefix := client.capabilities.Has(caps.MultiPrefix)
isUserhostInNames := client.capabilities.Has(caps.UserhostInNames)
maxNamLen := 480 - len(client.server.name) - len(client.Nick())
var namesLines []string
var buffer bytes.Buffer
for _, target := range channel.Members() {
var nick string
if isUserhostInNames {
nick = target.NickMaskString()
} else {
nick = target.Nick()
}
channel.stateMutex.RLock()
modes := channel.members[target]
channel.stateMutex.RUnlock()
if modes == nil {
continue
}
if len(buffer)+1+len(nick) > maxNamLen {
rb.Add(nil, client.server.name, RPL_NAMREPLY, client.nick, "=", channel.name, buffer)
buffer = nick
continue
prefix := modes.Prefixes(isMultiPrefix)
if buffer.Len()+len(nick)+len(prefix)+1 > maxNamLen {
namesLines = append(namesLines, buffer.String())
// memset(&buffer, 0, sizeof(bytes.Buffer));
var newBuffer bytes.Buffer
buffer = newBuffer
}
if buffer.Len() > 0 {
buffer.WriteString(" ")
}
buffer.WriteString(prefix)
buffer.WriteString(nick)
}
if buffer.Len() > 0 {
namesLines = append(namesLines, buffer.String())
}
buffer += " "
buffer += nick
for _, line := range namesLines {
if buffer.Len() > 0 {
rb.Add(nil, client.server.name, RPL_NAMREPLY, client.nick, "=", channel.name, line)
}
}
rb.Add(nil, client.server.name, RPL_NAMREPLY, client.nick, "=", channel.name, buffer)
rb.Add(nil, client.server.name, RPL_ENDOFNAMES, client.nick, channel.name, client.t("End of NAMES list"))
}
@ -263,37 +284,6 @@ func (channel *Channel) ClientHasPrivsOver(client *Client, target *Client) bool
return result
}
func (channel *Channel) nicks(target *Client) []string {
isMultiPrefix := (target != nil) && target.capabilities.Has(caps.MultiPrefix)
isUserhostInNames := (target != nil) && target.capabilities.Has(caps.UserhostInNames)
// slightly cumbersome: get the mutex and copy both the client pointers and
// the mode prefixes
channel.stateMutex.RLock()
length := len(channel.members)
clients := make([]*Client, length)
result := make([]string, length)
i := 0
for client, modes := range channel.members {
clients[i] = client
result[i] = modes.Prefixes(isMultiPrefix)
i++
}
channel.stateMutex.RUnlock()
i = 0
for i < length {
if isUserhostInNames {
result[i] += clients[i].NickMaskString()
} else {
result[i] += clients[i].Nick()
}
i++
}
return result
}
func (channel *Channel) hasClient(client *Client) bool {
channel.stateMutex.RLock()
defer channel.stateMutex.RUnlock()